题目
题型:不详难度:来源:
如图,
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045004-90865.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045004-41941.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045004-95287.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045004-90865.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045004-41941.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045005-66828.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045005-93446.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045005-84866.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045005-40599.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045006-67080.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045006-67382.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045006-82405.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045006-48974.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045004-95287.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045006-27975.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045004-90865.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045007-14185.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045007-66132.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045007-27835.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045004-95287.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045006-67080.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045007-27835.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045006-82405.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045004-90865.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045007-38675.jpg)
请从甲或乙的想法中选出一种测量方法,写出你的选择并按如下要求完成测量计算:①画出测量示意图;②用所叙述的相应字母表示测量数据,画图时
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045005-93446.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045008-80932.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045004-90865.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045008-60130.png)
解析
一般如果知道两角及一边或两边及一边的对角考虑采用正弦定理.如果知道三边或两边及夹角考虑余弦定理.
解:选甲:示意图1
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045008-44977.jpg)
图1 ----------4分
在
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045008-77030.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045009-19411.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045009-13826.png)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045009-22635.png)
在
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045009-22820.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045009-55935.png)
选乙:图2
图2----------4分
在
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045010-11185.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045010-32894.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045010-13967.png)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045010-52852.png)
在
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045010-18378.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045011-34587.png)
核心考点
试题【(本小题满分12分)如图,是底部不可到达的一个塔型建筑物,为塔的最高点.现需在对岸测出塔高,甲、乙两同学各提出了一种测量方法,甲同学的方法是:选与塔底在同一水平】;主要考察你对解三角形应用等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020045001-20944.png)
A.等腰三角形 | B.直角三角形 |
C.等腰直角三角形 | D.等腰三角形或直角三角形 |
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044955-56773.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044956-62509.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044956-66937.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044956-86914.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044956-77349.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044950-26882.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044950-52230.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044951-45582.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044951-31062.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044951-59978.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044951-11170.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044951-89532.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044951-38801.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044951-90956.png)
A.8 | B.9 | C.16 | D.18 |
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044945-61351.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044945-94210.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044945-88497.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044939-46352.png)
(1)求函数
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044939-65854.png)
(2)设
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044939-44662.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044939-15102.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044940-82940.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044940-21607.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020044940-98202.png)
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